Treatment of material containing derivatives of cellulose and product thereof



entire surface.

Patented June 13, 1933 UNITED STATES GEORGE RIVAT, OF

PATERSON, NEW J'ERSEY,'ASSIGNOR TO CELANESE CORPORATION OF AMERICA, A CORPORATION OF DELAWARE TREATMENT OF MATERIAL CONTAINING DERIVATIVES OF GELLULOSE AND PRODUCT THEREOF N0 Drawing.

This invention relates to the treatment of materials containing organic derivatives of cellulose whereby their aflinity towards certain dyestuffs is altered.

An object of my invention is to treat material and particularly textile material containing organic derivatives of cellulose With certain nitrogen compounds that tend to alter the aflinity of such materials towards certain dyestuffs. Other objects of my invention will appear from the following detailed description.

I have found that if materials containing organic derivatives of cellulose and particularly cellulose acetate are treated with certain organic nitrogen compounds, particularly triethanol amine, their affinity towards certain dyestuffs, particularly basic dyestuffs, is altered, such aflinity being generah ly reduced. I employ this discovery for the production of differential color effects as will be more specifically described.

In accordance with my invention I treat materials, particularly textile materials containing yarns of organic derivatives, with certain nitrogen compounds that alter their afiinity' towards certain dyestuffs, which treatment may be local or over the The so treated material may then be treated with the dye whereby many ornamental effects may be obtained.

While this invention is applicable to the treatment of materials containing organic derivatives of cellulose in general, such as organic esters of cellulose or cellulose ethers,

it will be described more particularly with respect to the treatment of textile materials containing yarns of cellulose acetate. Examples of other organic esters of cellulose are cellulose formate, cellulose propionate and cellulose butyrate while examples of cellulose ethers are ethyl cellulose methyl cellulose and benzyl cellulose.

The material to be treated may be in the form of yarn or it may be in the form of fabric. If yarn is to be treated it may be immersed in the form of hanks or wound onto bobbins, cones or other packages in a bath, containin the treating agent. If in the form of fa ric it may be immersed in Application filed June 21,

1929. Serial No. 372,802.

such bath, but preferably the treating agent is applied locally to the fabric by printing or stencilling in order to obtain the resist printmg eifect upon a subsequent application of the dyestuff.

The nitrogen containing agent that alters the aflinity of the cellulose acetate material is preferably triethanol amine N(CH CH OH) or salts thereof formed by neutralizing the same with acids such as sulfuric acid or acetic acid. However, I have found that other nitrogen compounds such as diethanol amine, NH(CH CH OH) pyrrol, pyridine or dimethyl aniline are also eifective for this purpose, but to a considerably less extent than is triethanol amine. The triethanol amine employed may have diethanol amine or mono ethanol amine admixed therewith.

In applying the triethanol amine in the form of a bath, it may be employed as an aqueous solution containing from less than 0.5 to 2.0% or more of the same, the temperature preferably being from to 90 (3., and the time of treatment being from 10 minutes or less to 25 minutes or more.

This invention may be employed to produce resist or reserve printing effects. In this case the triethanol amine or similar agent is incorporated in suitable amounts in a printing paste containing the usual thickeners such as gum tragacanth, gum arabic or British gum, examples of suitable amounts being from less than 10 to 30 or more grams of triethanol amine per liter of printing paste. After the local application of this paste, the fabric is steamed in open steam for 10 to 30 minutes and is then washed. The

fabric so treated has a differential affinity containing the triethanol amine or similar acting materials a dye for the fabric being treated. After the steaming or ageing and subsequent washing of the fabric so treated 15 it may be dyed with a dyestuff of another color whose affinity towards the treated portion is diminished, thus producing designs of one color against a background of a different color.

Beautiful cross-d e or differential color effects may be ro uced by associatin to gether yarns o cellulose acetate that ave been treatedwith the triethanol amine or similar substance with untreated yarns of cellulose acetate in any desired pattern. Thus two kinds of yarns may be woven together by means of jacquard or similar looms to produce any desired pattern, or they may alternate in the warp and/or weftv in any desired manner. When the fabric so formed is subjected to a dye bath containing a dyestufl towards which its afiinity is altered by treatment with the triethanol amine, differential 'color effects are produced.

As to the dyestuff towards which cellulose acetate textile material that has been treated with triethanol amine or similar substances has a diminished affinity, a large number of basic and certain direct and acid dyestuffs have been found to have this property.

Examples of basic dyestuffs which have a greatly diminished affinity for cellulose acetate material treated with triethanol amine are:

Group A Schultz No.

Methylene blue 659 Capri blue 620 1lzlyronine G 568 alachite green 495 Auramine 193 Schultz No.

Chrysoidine 36 Phosphi-ne 606 Thiofiavine 618 Fuchsin 512 Methyl violet 518 Saframine 679 Dianisidine (diazotised and developed with beta hydroxyl naphthoic acid).

Examples of basic dyestuffs whose affinity Group G Schultz No. Methylene grey 681 Acridin orange 603 In order further to illustrate my invention but without being limited thereto, the following specific examples are given.

Example I Yarn of an acetone soluble cellulose acetate in the form of hanks are immersed in an aqueous solution containing 10 to 15 grams oftriethanol amine per liter at a temperature of to 80 C. for 15 minutes. The yarn so treated is woven with untreated yarn of cellulose acetate into a fabric of any desired construction and the fabric thus formed is treated in a dye bath containing any of the dyestuffs of Group A. If the amount of dycstufi' present is relatively small the yarn that has been treated with the triethanol amine is substantially undyed while the untreated yarn is dyed thus producing beautiful effects of mixed color and white.

Example I I A fabric consisting wholly of acetone soluble cellulose acetate yarn is printed with a paste containing 10 to 20 grams of triethanol amine per liter and gum tragacanth as thickener. The paste is locally applied by means of printing rollers for desired designs engraved thereon. The fabric after application of the paste is steamed for 15 to 20 minutes in open steam, washed and then dyed with a bath containing any of the dyes of Group A. Substantially white designs on a colored background are produced.

It is to be understood that the foregoing detailed description is given merely by way of illustration, and that many variations may be made therein without departing from the spirit of my invention.

Having described my invention, what I claim and desire to secure by Letters Patent is:

1'. Method of altering theaflinity of materials containing organic" derivatives of cellulose towards certain dyestuffs comprising treating at least part of said material containing the organic derivative of cellulose with a substance, selected from the group consisting of ethanolamines and their salts, capable of altering said affinity.

2. Method of altering the affinity of materials containing organic esters of cellulose towards certain dyestuffs comprising treating at least part of said material containing the organic ester of cellulose with a substance, selected from the group consisting of ethanolamines and their salts, capable of altering said affinity.

3. Method of altering the affinity of materials containing cellulose acetate towards certain dyestuffs comprising treating at least part of said material containing the cellulose acetate with a substance, selected from the group consisting of ethanolamines and their salts, capable of altering said affinity.

4. Method of altering the affinity of material containing organic derivatives of cellulose towards certain dyestuffs comprising rial with a substance, selected from the group consising of triethanol amine and its salts, capable of altering its aflinity towards certain dyestufls and then treating the textile material with such dyestufis.

7. Method of coloring textile materials containing yarns of cellulose acetate comprising treating at least part of the textile material with a substance, selected from the group consising of triethanol amine and its salts, capable of decreasin its aflinity to- Wards certain basic dyestu s and then treating the textile material with such basic dyestufis.

8. Method of producing difierential color effects comprising locally applying to fabric containing yarns of organic derivatives of. cellulose, a material, selected from the group consisting of triethanol amine and its salts, which is capable of altering its aflinity towards certain dyestuffs and then dyeing the treated material with such dyestufis.

9. Method of producing difierential color effects comprising locally applying to fabric containing yarns of cellulose acetate, a material, selected from the group consisting of triethanol amine and its salts, which is capable of altering its affinity towards certain dyestuffs and then dyeing the treated material with such dyestuffs.

10. Method of producing differential color effects comprising locally applying to a fabric containing yarns of cellulose acetate, a material, selected from the group consisting of triethanol amine and its salts, which is capable of decreasing its affinity towards certain basic dyestuffs and then dyeing the treated material with such dyestufi's, whereby the treated parts are lighter in color.

11. Materials containing derivatives of cellulose at least part of which has been treated with a substance selected from the group consisting of ethanolamines and their salts, capable of altering its affinity towards certain dyestuffs.

12. Materials containing cellulose acetate at. least part of which has been treated with a substance, selected from the group consisting of ethanolamines and their salts, capable otf altering its afiinity towards certain dye- S 11 S.

13. Material containing yarns of cellulose acetate at least part of which has been treated with a substance, selected from the group consisting of triethanol amine and its salts, capable of altering its aflinity towards certain dyestuifs.

In testimony whereof, I have hereunto sub scribed my name.

GEORGE RIVAT'. 

